Question

Between two stations, a train accelerates from rest uniformly then moves with constant velocity, and finally

retards rmly to come to rest. If the ratio of the time taken is1 and the maximum speed attained be 60 kmh-1

,

then lit is the average speed over the whole journey?​

Answer 1

Answer:

54km

Explanation:

S

1

=

2

1

at

2

=

2

1

(at)t=

2

60t

=30t

S

2

=60×8t=480t,S

3

=S

1

=30t

v

av

=

t+8t+t

S

1

+S

2

+S

3

=54 km h